WIP: 0x4f

piersholt · Feb 27, 2021 · 82bd972 · 82bd972
1 parent 9d86ab9
commit 82bd972
Showing 1 changed file with 15 additions and 7 deletions.
diff --git a/bmbt/4f.md b/bmbt/4f.md
@@ -1,10 +1,18 @@
 # `0x4f` Monitor Control
 
-This command is used to control the BMBT monitor.
+GT `0x3b` → BMBT `0xf0`  
+TV `0xed` → BMBT `0xf0`
+
+This command is used to control, and configure the BMBT monitor.
 
 It's very helpful when testing navigation computers, and video modules which might not support automatic encoding, and aspect ratio switching.
 
-## Examples
+### Related Commands
+
+- `0x2b` [Telephone LEDs](../telephone/2b.md)
+- `0x4a` Tape Control/Radio LED
+
+### Example Frames
 
     # GT
     3B 04 F0 4F 10 90       # Monitor on at KL-R
@@ -14,7 +22,7 @@ It's very helpful when testing navigation computers, and video modules which mig
     ED 05 F0 4F 11 12 54    # Open "Television" (On, TV, 16x9, NTSC)
     ED 05 F0 4F 12 11 54    # Return to Main Menu (On, Nav. GT, 16x9, PAL)
 
-## Properties
+## Parameters
 
 Two byte bitfield, although the second byte is often negated by GT.
 
@@ -26,15 +34,15 @@ Two byte bitfield, although the second byte is often negated by GT.
     ENCODING     = 0b0000_0011 << 0
     ASPECT_RATIO = 0b0011_0000 << 0
 
-## Source `0b0000_0011 << 8`
+### Source `0b0000_0011 << 8`
 
     SOURCE_NAV_GT = 0b0000_0000
     SOURCE_TV     = 0b0000_0001
     SOURCE_VID_GT = 0b0000_0010
 
 The input source switching in handled by the video module, but each source has it's own brightness settings which is recalled.
 
-## Power `0b0001_0000 << 8`
+### Power `0b0001_0000 << 8`
 
     POWER_OFF     = 0b0000_0000
     POWER_ON      = 0b0001_0000
@@ -43,14 +51,14 @@ This will turn the monitor on, or off accordingly.
 
 The GT will turn the monitor on at ignition position 1 (KL-R), and off at ignitition position 0.
 
-## Encoding `0b0000_0011 << 0`
+### Encoding `0b0000_0011 << 0`
 
     ENCODING_NTSC = 0b0000_0001
     ENCODING_PAL  = 0b0000_0010
 
 Encoding issues are commonly seen when switching between different generation navigation computers, or video modules, as there did seem to be a switch between PAL and NTSC as the encoding for navigation computer video. Incorrect encoding is usually denoted by "scrolling" video image.
 
-## Aspect Radio `0b0011_0000 << 0`
+### Aspect Radio `0b0011_0000 << 0`
 
     ASPECT_4_3    = 0b0000_0000
     ASPECT_16_9   = 0b0001_0000